Looks like 7 inch throat. If you have big work, this is the right clamp. Now called GSM50 but these are even heavier.
2660 Lbs of down force. The item "Holding Vise BESSEY CLAMPS HEAVY DUTY 20 x 6-1/2 force to 2660 Lbs. 2 Pcs" is in sale since Sunday, July 29, 2018. This item is in the category "Home & Garden\Tools\Hand Tools\Clamps & Vises". The seller is "geoline44" and is located in Bedford, Ohio.
This item can't be shipped, the buyer must pick up the item.